Added SDL_GetDefaultLogOutputFunction()

Fixes https://github.com/libsdl-org/SDL/issues/10603
Closes https://github.com/libsdl-org/SDL/pull/11106

include/SDL3/SDL_log.h

@@ -473,6 +473,20 @@ extern SDL_DECLSPEC void SDLCALL SDL_LogMessageV(int category,
  */
 typedef void (SDLCALL *SDL_LogOutputFunction)(void *userdata, int category, SDL_LogPriority priority, const char *message);
 
+/**
+ * Get the default log output function.
+ *
+ * \returns the default log output callback.
+ *
+ * \threadsafety It is safe to call this function from any thread.
+ *
+ * \since This function is available since SDL 3.1.6.
+ *
+ * \sa SDL_SetLogOutputFunction
+ * \sa SDL_GetLogOutputFunction
+ */
+extern SDL_DECLSPEC SDL_LogOutputFunction SDLCALL SDL_GetDefaultLogOutputFunction(void);
+
 /**
  * Get the current log output function.
  *
@@ -485,6 +499,7 @@ typedef void (SDLCALL *SDL_LogOutputFunction)(void *userdata, int category, SDL_
  *
  * \since This function is available since SDL 3.0.0.
  *
+ * \sa SDL_GetDefaultLogOutputFunction
  * \sa SDL_SetLogOutputFunction
  */
 extern SDL_DECLSPEC void SDLCALL SDL_GetLogOutputFunction(SDL_LogOutputFunction *callback, void **userdata);
@@ -499,6 +514,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_GetLogOutputFunction(SDL_LogOutputFunction
  *
  * \since This function is available since SDL 3.0.0.
  *
+ * \sa SDL_GetDefaultLogOutputFunction
  * \sa SDL_GetLogOutputFunction
  */
 extern SDL_DECLSPEC void SDLCALL SDL_SetLogOutputFunction(SDL_LogOutputFunction callback, void *userdata);

src/SDL_log.c

@@ -772,6 +772,11 @@ static void SDLCALL SDL_LogOutput(void *userdata, int category, SDL_LogPriority
 #endif
 }
 
+SDL_LogOutputFunction SDL_GetDefaultLogOutputFunction(void)
+{
+    return SDL_LogOutput;
+}
+
 void SDL_GetLogOutputFunction(SDL_LogOutputFunction *callback, void **userdata)
 {
     SDL_LockMutex(SDL_log_function_lock);

src/dynapi/SDL_dynapi.sym

@@ -1180,6 +1180,7 @@ SDL3_0.0.0 {
     SDL_DelayPrecise;
     SDL_CalculateGPUTextureFormatSize;
     SDL_SetErrorV;
+    SDL_GetDefaultLogOutputFunction;
     # extra symbols go here (don't modify this line)
   local: *;
 };

src/dynapi/SDL_dynapi_overrides.h

@@ -1205,3 +1205,4 @@
 #define SDL_DelayPrecise SDL_DelayPrecise_REAL
 #define SDL_CalculateGPUTextureFormatSize SDL_CalculateGPUTextureFormatSize_REAL
 #define SDL_SetErrorV SDL_SetErrorV_REAL
+#define SDL_GetDefaultLogOutputFunction SDL_GetDefaultLogOutputFunction_REAL

src/dynapi/SDL_dynapi_procs.h

@@ -1211,3 +1211,4 @@ SDL_DYNAPI_PROC(Uint32,SDL_StepBackUTF8,(const char *a, const char **b),(a,b),re
 SDL_DYNAPI_PROC(void,SDL_DelayPrecise,(Uint64 a),(a),)
 SDL_DYNAPI_PROC(Uint32,SDL_CalculateGPUTextureFormatSize,(SDL_GPUTextureFormat a, Uint32 b, Uint32 c, Uint32 d),(a,b,c,d),return)
 SDL_DYNAPI_PROC(bool,SDL_SetErrorV,(SDL_PRINTF_FORMAT_STRING const char *a,va_list b),(a,b),return)
+SDL_DYNAPI_PROC(SDL_LogOutputFunction,SDL_GetDefaultLogOutputFunction,(void),(),return)